The Familiar of Zero: "Rondo" of Princesses is a tV series anime that premiered in summer 2008, produced by J.C.STAFF.

About the production: the story comes from a light novel, there are 12 episodes of about 24 minutes and its current status is "finished".

Its main genres are action, adventure, comedy, ecchi, fantasy and romance, with themes such as Magic, Isekai, Tsundere and Female Harem.

On AniList, The Familiar of Zero: "Rondo" of Princesses has an average score of 69%, a good score, and appears on 78,192 users' lists.

The franchise continues in or follows from: Zero no Tsukaima: Futatsuki no Kishi and Zero no Tsukaima F.

Following Saito's heroic actions in the War with Albion in season two, Saito & Louise return to Tristain, only to have the runes which bind Saito & Louise disappear. Saito & Louise struggle with a relationship no longer defined as Master & Familiar, as they search for an Elf who has the power to restore the dead to life, and may hold the key to understanding Saito's loss of the Gandalfr's power. (Source: Anime News Network)

Official synopsis from AniList.